An electrical connector has a receiving space (10) and includes an insulative housing (1) and a set of contacts. The insulative housing includes a tongue portion (12) protruding into the receiving space. The tongue portion has a mating face (14), a set of depressions (141) formed in a front region of the mating face, and a set of passageways (142) defined in a rear region of the mating face and being spaced away from the depressions. The contacts are held in the tongue portion and include a set of first and second contacts (21,22). The first contacts have elastic first contact portions (15) being movably received in the passageways and protruding beyond the mating face and into the receiving space, and first tail portions (16) opposite to the first contact portions. The second contacts have stiff second contact portions (25) retained in the depressions and exposed to the receiving space, and second tail portions (28) opposite to the second contact portions. The first and the second tail portions are arranged in only a single row.